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Fluid mechanical valving of air flow in bird lungs

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Figure

Fig. 2. (A) During the calibration procedure, the cranial air sac openings were sealedshut (hatching) and the primary bronchus blocked between the orifices of the
Fig. 3. A calibration graph. The vertical axis represents the absolute value of thepressure difference between D and V in Fig
Fig. 5. Flow patterns in models. Arrows indicate the flowpassage. Stars indicate no net flow (at this of water in plastic models ata rate of 10cm3s~1 when the resistance of the hose on the cranial air sac orifice wassuch that the paleopulmo received the sa

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